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a. Explain how the age of rocks can be determined by radioactivity. Give an example.
b. How can scientists determine the internal structure of the Earth, if the depth of the deepest well is only a tiny fraction of the earth's diameter?
for this module you will investigate the operation of antennas. antennas can both transmit and receive electromagnetic
1000 gallons per minute of fluid flows through a 3 inch diameter pipe. what is the average velocity of the water
The four masses shown in Figure Ex13.17 are connected by massless, rigid rods, with m = 184 g. Find the coordinates of the center of mass.
An astronaut is being tested in a centrifuge. The centrifuge has a radius of 10 m and, in starting, rotates according to ? = 0.30t2, where t is in seconds and ? is in radians. (a) When t = 15.0 s, what is the magnitude of the astronaut's angular v..
A solid ball has a weight of 3.0N. When it is submerged in water,it has an apparent weight of 2.7N. What is the density of the ball
one billiard ball is shot east at 2.15 ms. a second identical billiard ball is shot west at 1.42 ms. the balls have a
A fire hose ejects a stream of water at an angle of 30.4 ° above the horizontal. The water leaves the nozzle with a speed of 29.3 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit t..
Aingly-ionized lithium has a nucleus of charge +3e and two electrons. Use the variational principle to estimate the ground-state energy. Now consider a nucleus of charge Ze with two electrons. Use the variational principle to estimate the ground-st..
A weather balloon filled with helium gas has a volume of273 m3 and pressure 1.4 105 Pa at the Earth's surface (where thetemperature is 293 K). What is the new volume ofthe balloon
A 0.15 kg meter stick is balanced with the pivot point at the 18 cm mark. A weight of 3.2N is hung from the shorter end. Where should the weight be positioned in order to balance the meter stick?
A single loop of area 0.183 m2 is placed perpendicular to a magnetic field of 0.304 T. What is the angular speed of the loop
A hockey player is standing on hisskates when an opposing player skates by with the puck, movingwith a constant speed of 12 m/s. After 3.0 s, the first playermakes up his mind to chase his opponent and starts acceleratinguniformly at 3.8 m/s2.
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